These modern K-mount lenses are designed specifically for use with DSLRs and other K-mount digital cameras such as the K-01. They feature autofocus, auto aperture control, and some are even weather sealed (DA* or WR designation).
The DA series is Pentax's current main line of APS-C format lenses, while the D-FA series support full-frame cameras. DA Limited lenses are very compact yet are designed to deliver the highest in image quality, and DA* lenses correspond to Pentax's professional lineup. DA L lenses are budget lenses (with a plastic mount and no hoods) typically bundled in camera kits, though they are optically identical to their DA-series counterparts.